Correlated electrons in optically-tunable quantum dots: Building an electron dimer molecule

Details Correlated electrons in optically-tunable quantum dots: Building an electron dimer molecule Correlated electrons in optically-tunable quantum dots: Building an electron dimer molecule

2010-02-16

arxiv.org/abs/1002.3114v2

Physical Review Letters 104, 246802 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTeX 4.0, 6 pages, 6 color PDF figures. Revised version including Supplementary Discussion of Wigner localisation (2 new fig

Scientific paper

10.1103/PhysRevLett.104.246802

We observe the low-lying excitations of a molecular dimer formed by two electrons in a GaAs semiconductor quantum dot in which the number of confined electrons is tuned by optical illumination. By employing inelastic light scattering we identify the inter-shell excitations in the one-electron regime and the distinct spin and charge modes in the interacting few-body configuration. In the case of two electrons a comparison with configuration-interaction calculations allows us to link the observed excitations with the breathing mode of the molecular dimer and to determine the singlet-triplet energy splitting.

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